Stoker



mum EN mww Rm RN F. H. BROWN STOKER Original Filed Dec. 21, 1922 k Ki 0 M l 0 2 1 QkN ID. wih e M F m: L N M k Patented Feb. 20, 1940 UNITED srarss 2,190,974 s'roKEa Francis H. Brown, Ridley Park, Pa., assignor to The Real Estate-Land Title and Trust Company, Philadelphia, Pa, a corporation of Pennsylvania, trustee Original applicatien December 21, 1922, Serial 608,228. Divided and this application ()ctober 22, 1934, Serial No. 749,436

2 Claims.

whereby to increase the efficiency and utility of the furnace, it will be readily understood that the invention is not limited to such an adaption, but

finds a wide field of utility for other purposes.

Among the more important objects and adthe provision of an improved method of and apparatus for conveying and distributing fuel, such as coal and the like; the provision of an improved method of and apparatus for delivering fuel, such as coal, for use within a furnace; the provision of an improved method of and apparatus for sizing and delivering fuel to a furnace; the provision of an improved apparatus for sizing and delivering fuelin measured increments to a furnace.

Among the further objects and advantages of this invention, are: the provision of improved mechanism for sizing and delivering fuel in desired increments to a furnace, and to this end I provide an improved fuel co-nveying and depositing mechanism characterized bythe provision of means for regulating the point in the furnace at which the fuel is to be delivered; the provision of an improved method of and apparatus for introducing comminuted fuel, such as pulverized coal into a furnace; the provision of an improved method of and apparatus for introducing comminuted fuel, such as pulverized coal into a furnace by the utilization of an improved method of and apparatus for introducing pulverized fuel into a furnace at a plurality of separate points and the provision of means for controlling the amount of fuel so delivered as between the sev.. eral points of delivery; the provision of an apparatus for delivering comminuted fuel into a furnace which affords positive mechanical agitation of the fuel and eliminates clogging; and the provision of improved means whereby the is operated in proper co-ordination with the fuel distributing mechanism.

The foregoing and such other objects and advantages as may appear or be pointed out as this description proceeds are attained in the vantages which characterize this invention, are:

variable.

fuel sizing and delivering mechanism referred to structural embodiment illustrated in the accompanying drawing, in which:

Figure 1 is a fragmentary sectional view of a furnace embodying this invention;

Figure 2 is a partial end elevation of the struc- 5 ture shown in Figure 1.

Figure 3 is a further partial end elevation of the structure shown in Figure 1.

Referring now to the drawing and first to Figures 1 and 2. 110

There is provided a fire box 250, having the conventional rear wall 25!, front wall 252, and water or fire tubes 253, as the case may be.

Inthe form of the invention here illustrated, there are provided comminuted fuel feeding devices which are adapted to receive and discharge into the furnace from the front thereof such fuel in desired increments, which increments may be To this end a group of feeding devices 254 are placed in an opening 255 provided in the front wall 252, there being three of the feeding devices shown, but, of course, it will be readily understood that a greater or less number may be employed as desired.

As the feeding devices are identical, I will describe but one of the same, which is shown as including a cylindrical casing 256 arranged horizontally across the front of the furnace and supported in blocks 25! and 258, which latter may be other fire resistant material. The casing 256 is provided with an outlet 259 which registers with a slot 25!] afforded by spacing the blocks 251 and 258, so that a discharge opening into the furnace is thereby afforded. The casings 256 may be revolved through a part of the circle in orcler to close off the fuel discharge opening 259.

The casing 256 projects beyond one side of the front wall 252, as best shown in Figure 4, and a handle 264 is provided thereon for shifting said casing and thus cutting off the supply of fuel, or for varying the size of thedischarge opening 26!].

Within the casing 255 there is provided a revoluble sleeve 26! provided with outlet openings 262, said sleeve being mounted on a revoluble shaft 263.

The shafts 263 of the cylindrical sleeves 26! project beyond. the ends of the brackets 25'! and are connected in any desired manner to suitable driving mechanism. The bevel gears 21"! are so 50 mounted on the shaft 218 as to be adjustable as to position. This can be conveniently accomplished by the use of stud bolts carried by the hubs of the gears 21! and acting as set screws with respect to the shaft 218. This permits the 56 use of various sizes of bevel gears 216 which can be selected and varied to meet the requirements of operation. By the use of gears 21B of varyin ratios with respect to gears 211, the several ele-\ with bevel gear wheels 21'! mounted upon the shaft 218 which in turn is driven by a suitable source of power. It will be understood that such an arrangement affords a wide range of control of rate of fuel feeding; in other Words, fuel can be fed at the same rate of speed from all of the inlet openings, or the size of these openings may be varied relatively or simultaneously by rotating the casings 256 by the handles 264, or the speed of rotation of the cylinders 26! may be varied as desired. Furthermore, fuel may be supplied in increments, simultaneously, alternately, or successively from theinlet openings. Thus the quantity of fuel, and rate of flow, may [be controlled as the operator sees fit.

I have illustrated a pulverized fuel supply system which is, of course, merely exemplary of one Way of supplying powdered fuel to the feeding devices, this feeding device comprising an electric motor mounted on a suitable base 266, and having its armature shaft 2t? direct-connected to ablower 268 provided with an intake for an 269, and an intake 278, which latter leads to a suitable fuel pulverizing plant not shown. The blower is provided with a discharge opening 2', and the curved pipes 212-272 serve to connect said discharge opening directly to each of the cylinders 268. As will be seen in Figure 4, the pipes 2'52 enter the cylinders axially, and in said pipes there are provided butterfly valves 213 which control supply of fuel to the cylinders.

The front of the feeding device is closed by a plurality of sliding doors Tit-4T4 arranged in slides, 215-215. These sliding doors permit a ready access to the feeding device for cleaning or,

repairing.

It will be observed that the pulverized fuel is fed under pressure axially to the cylinders 26l, and discharged radially therefrom, the revolving of said cylinders tending to provide mechanical agitation which prevents clogging, and thus aid in its projection into the furnace.

It will be obvious that minor alterations to suit different conditions may be required in the structures shown in Figures 1, 2, and 3, but it is to be understood that they illustrate broadly mechanical means for carrying out the idea of feeding powdered fuel to a furnace in increments by fluid pressure. a

This application is a division of my co-pending application Serial No. 608,228 now Patent No. 1,977,620.

Having thus described my invention and illustrated its use, what I claim as new and desire to one within the other and means for continuously rotating one of said tubes with respect to the other, said tubes each having openings which register periodically during rotation.

2. In a furnace structure, in combination, a fire box and means for injecting comminuted fuel into said fire box by a stream of fluid under pressure comprising means to create the stream of fluid and mix the fuel therein, valving elements for discharging the mixture into the fire box, and

means for imparting movement to said valving ,40

elements whereby the fuel passing therethrough is agitatedto prevent clogging.

FRANCIS H. BROWN. 

